Cement-burning kiln.



PATBNTED Nov. 28, 1905.

vNol: y805,953.

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G. D. HELMICK. CEMENT BURNING KILN. APPLICATION FILED Mmm. 1905.

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PATENTED Nov. 2a, 1905.

G. D. HELMIGK. y CEMENT BURNING KILN.-

APPLIGATION FILED MAR.27, 1905.

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lllllllllllll No. 805,953. PATBNTBD Nov. 2s, 1905. G. D.v HBLMIGK. 5 f

CEMENT BURNING KILN.

APPLICATION FILED MAR.27, 1905.

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'PATENT oFFIo.

GUY DrHELMICK, FORT RUSSELL, W'YOMIhUSr.A

CEMENT-BURNINC-r. KILN.

d Specification of Letters Patent.

Patented Nov. 28, 1905.

111.11115555315155 March 27,1905. sgml N. 252,295.

To all whom it may concern: Be it known that I, GUY D. HELMICK, a citizen of the United States, residing at Fort Russell, in the county of Laramie and State of Viyotning, have invented certain'new and useful Improvements in Cement-Burning Kilns; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art. to which it appertains to make and use the same.

This invention relates vto cement-burning kilns, and is designed as an improvement over the earlier and more common means of calcining Portland-cement clinker with the use of a rotary furnace which, although economical of labor, is wasteful of fuel, largely due to the excess of cold air introduced into the furnace to support combustion and the high temperature of the Waste gases discharged up the stack.' The main supply of heat used in the process of calcination is commonly derived from the combustion of gas, oil, or powdered coal at the mouth of the furnace, the heated gases therefrom passing over the cementclinker and still retaining about fifty per cent. of their heat units when passing from the furnace.

The object of the invention is to provide improved means adapted to utilize this immense amount of otherwise lost heat, preferably through the use of a battery of regenerawhich are alternately heated by the waste products of combustion andv` are used in turn when so heated to heat the air introduced into the mouth of the furnace to support combustion, suitable means being provided in the line of travel of the gases to thoroughly clean them before the regenerative apparatus is reached.

To the accomplishment of this object and such others as vmay hereinafter appear, the invention comprises the novel construction hereinafter described, and pointed out in the claims, reference being had to the accompa- 1 nying drawings, showing the preferred embodiment thereof, in which the same reference characters designate like parts throughout the several views, and in which- Figure l is a plan view ofthe kiln, showing how a number of rotary furnaces may be used and on both sides of the stack. Fig. 2 is a sectional elevational view on line 2 2 of Fig. 1. Fig. 3 is a sectional plan View on line 3 3 of Fig. 2. Fig. 4is asectional elevationalview on line-4 4 of Fig. 1. Fig. 5 is an elevational View i naCGS.

of one of the dust-chambers, partly broken iaway. Fig. 6 is a sectional elevational View on line' 6 6 of Fig. 5. Fig. 7 is a front elevaand set at a slight incline, so that materials introducedinto the upper end are gradually carried to and discharged at the lower end by the rotation of the furnace. The upper ends of these furnaces 10 are each surrounded by a iue or chamber 11, which are in turn inter'- connected by a main ue 12, which runs transversely beneath'the ends of the rotary fur- This ue 12 is preferably located centrally above the upper floors of a pair of chambers or iiues 13 and 14, which are formed into regenerative furnaces by filling them with the usual checker-work of fire-brick. (Not shown.) Thel regenerative furnaces 13 and 14 are connected through suitable openings 15 and 16,respectively, with a passage-way 17, provided with. a manhole 18, which opens into a stack 19, which preferably is provided with a centrally-arranged vertical partition 20, so that similar regenerative furnaces 13a and 14*L may be connected up in a similar manner, as described, tothe other side thereof. tive furnaces suitably connected to the kiln, v

A suitable. connection between flue 12 and the regenerative furnaces 13 and 14 is constructed as follows: The end of ue 12 after passing the rotary furnace 10 `farthest from stack 19 assumes a downwardly-directed spiral form 21 and connects with a chamber 22,l

extending transversely across the ends of realso provided with doors 29 for -thepurpose ofinspection. 1.

In any suitable'. position,y preferably. at the end of the apparatus; adjacent stack 19, is lo- IOO cated any suitable means, as a rotary fan 30, of suitable power for forcing air into a Hue 31, which is connected to regenerative furnaces 13 and 14 through openings 32 and-33, respectively. The opposite ends of furnaces 13 and 14 are also provided with openings 34' and 35, respectively, which lead into aHue 36, provided with a manhole 37, which Hue in turn leads into a pipe 38, provided with branches 39,"eXtending into the forward end of` each of thel furnaces 10.

Adarn'per-door40 is mounted between openings 23 yand 34 in one end of regenerative furnace 13,` so thatv when it closes one of said openings the other will always be open.y Doors 41, 42, and 43 aresimilarly situated between openings 24 35, 1532, and 1633, respectively. As these doorsfare subject to a-very greatheat, they are preferably water-cooled, andl to this end are made hollow by constructing them ofl a pair of plates 44, suitably connected by channelsv or other sections, whereby a box-like structure is formed, into which water may be continuously run through an opening 45 in the topfrom aiwater-pipe 46, leading to any source ofsupply controlled by avalve 47. In the interior of the doors is located an overHowpipe 48, which projects from one side of the bearing above the level of the upper Hoor of the regenerative chambers,- as shown at 49.

. It is essential that when openings33 'and 35, leadingfrom the regenerative furnace'14, are closed byftheir doors43 and 41, respectively, openings 15-and23, leading from regenerative furnace 13,- should be closed by their doors 42 and 40.. respectively. Itis also convenientthat all these four doors should be operated at the same time, and any suitable mechanism which will accomplish Lthisdesired endmaybe used; but thepreferred form is shown inFigs.v 1 and 7 whichrconsists of a beveled gear-wheel 50,.mounted onthe axis-of each of the four doors,` which gears are so connectedl with other beveled gears 51, mounted on the ends of rods 52, that when the gears on, say,

doors 42 and 43 are rotated'by means of shaft 53, having gears 54 thereon engaging the gearsv 50,-all the doors will be rotated in the direction and through the angle desired. Shaft 53 may be rotatedabyI any suitable'means, those hereV shownbeing merely a hand-crank 55.

It shouldbelunderstood that the apparatus connected upto the right-hand side of stack 19 in Fig. 1 issimilar in-all respects to that already described, and therefore a detailed descriptionthereof is not deemed necessary.

Inthe operation'of thefurnaee it will be assumed'that the. four damper-doors are'in theA position shown in Fig. 3. Now when-heat is generatedfat the lower end of furnaces 10 and the gasesfare -sent therethrough over the cement'mixure which hastbeen previously` fedV therein through the upper end by any suitable y meansin general use'these gases are collected fromvallftheffurnacesl inHue12` and are drawn sioned by the swirl of the gases drives the dust contained therein into the quiescent atmosphere of dust-chambers 25, where it is collected and carried 0H" as before described. On reaching chamber 22, the opening 23 being closed v by door 40, the gases pass through opening 24 and heat the checker-work of fire brick in chamber 14, afterward passing through opening16 and up the stack 19. When this action has been carried on for a sufficientl period to thoroughly heat the bricks in chamber 14, rod 53 is rotated suHiciently to move the four damperldoors from the positions shown in full lines in Fig. 3 to those shown in dotted lines, which throws openings 33 and 35 of chamber 14 clear and openings 15 and 23 of chamber 13 clear. The How of the gases-is therefore changed to pass through and heat the fire-brick in chamber- 13 instead of in chamber 14, and while this heating operation is taking place fan 30 isset in operation, drawing cold air into Hue 31, which air it forces through opening 33 and into regenerative furnace 14, in passing through which furnace the air takesup the heat from the fire-bricks, and passing out of opening 35. and into Hue 36 finally findsits wayinto pipe 38 and through its branches 39 into the forward end of the furnace, where it is-used in this heated condition to support combustion. When the fire-brick in chamber 13 have been suHiciently heated, the damper-doors are again thrown back into their formerfposition'and the cold air from fan 30 is sent through this chamber instead of through chamber 14,.the operation of heating the air used to support combustion being thus kept up indefinitely through the use of the waste furnace-gases.

It is not desired to be understood that the invention is limited to the details of construction and arrangement of parts as herein described and illustrated, as it is manifest that numerous variations and modifications maybe made in adapting the-device to various conditions of use without departing from the spirit and scope thereof. The right is therefore reserved to all such variations-and modifications as properly fall within the scope of the inventionand the terms of the following claims.

I claim- 1. The combination with a burning-furnace,

`of a regenerator located below said furnace,

a spirally-descending Hue communicating between said furnace and said regenerator and providedwith an aperture initsv peripheral surface, a dust-collecting box adjacent said aperture, and Hue connections between said Iregenerator and said-furnace for 1ntroducing the returned heated air to the material being` treated.

2. The combination with a plurality of burning-furnaces, of a plurality of regenerators IOO IIO

ISO

below said furnaces, a spirally-descending flue communicating between said furnaces and said regenerator and provided Withapertures in its peripheral surface, dust-collecting boxes adjacent saidapertures, and Hue connections between said regenerator and said furnaces for introducing the returned heated air to the material being treated.

3. The combination with a plurality of burn-V 4. The combination with a burning-furnace,

of a regenerator, a spirally-descending flue.

communicating between said furnace and said regenerator, provided with an aperture 1n lts periphery, a` dust-collecting box adjacent'said aperture` said'box having a slanting floor and an eXlt-openmg, and independent flue connections between said regenerator and sald furnace arranged out; of the limitsof said,

spiral flue. v v

In testimony whereof I afx my signature in presence of two Witnesses.

GUY D. HELMICK. s

Witnesses:

GEO. A. CURRY, F. D. FRENCH. 

